title: Gold(I) complexes with hydrogen-bond supported heterocyclic carbenes as active catalysts in reactions of 1,6-enynes.
abstract: Complexes [AuCl{C(NHR)(NHPy-2)}] (Py-2 ) 2-pyridyl; R ) Me, tBu, nBu, iPr, nheptyl) have been prepared in amodular way from [AuCl(CNPy-2)]. The carbene moiety has a hydrogen-bond supported heterocyclic structure similar to the nitrogen heterocyclic carbenes in the solid state, and in CH2Cl2 or acetone solution, which is open in the presence of MeOH. The compounds are good catalysts for the skeletal rearrangement of enynes, and for the methoxycyclization of enynes. In contrast, the complexes [AuCl{C(NHR)(NHPy-4)}] are scarcely active due to the blocking effect of the coordination position required for the catalysis by the nitrogen of the NHPy-4 group.
authors.affiliation: IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, UniVersidad de Valladolid, E-47071 Valladolid, Spain.
authors.forename: Camino
authors.initials: C
authors.lastname: Bartolomé
authors.forename: Zoraida
authors.initials: Z
authors.lastname: Ramiro
authors.forename: Patricia
authors.initials: P
authors.lastname: Pérez-Galán
authors.forename: Christophe
authors.initials: C
authors.lastname: Bour
authors.forename: Mihai
authors.initials: M
authors.lastname: Raducan
authors.forename: Antonio M
authors.initials: AM
authors.lastname: Echavarren
authors.forename: Pablo
authors.initials: P
authors.lastname: Espinet